public class LatLong {

	public double distance(double lat1, double lon1, double lat2, double lon2,
			String string) {
		double theta = lon1 - lon2;
		double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2))
				+ Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2))
				* Math.cos(deg2rad(theta));
		dist = Math.acos(dist);
		dist = rad2deg(dist);
		dist = dist * 60 * 1.1515;
		if (string == "K") {
			dist = dist * 1.609344;
		} else if (string == "N") {
			dist = dist * 0.8684;
		}
		return (dist);

	}

	/* ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: */
	/* :: This function converts decimal degrees to radians : */
	/* ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: */
	private double deg2rad(double deg) {
		return (deg * Math.PI / 180.0);
	}

	/* ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: */
	/* :: This function converts radians to decimal degrees : */
	/* ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: */
	private double rad2deg(double rad) {
		return (rad * 180.0 / Math.PI);
	}

	public static void main(String args[]) {
		LatLong l = new LatLong();
		System.out.println(l.distance(13.62876, 79.41918, 13.21710, 79.10067,
				"M") + " Miles\n");
	}

}